I like what you got going here, but the Kaiten seems to be bugging me. Doesn't Neji do more of a spin before he uses Kaiten, like he starts spinning slow, then goes really fast, but really. it's all good. pretty nice smooth animation.

Some C&C...
Your base icon needs a minor fix.
The feet look like rubber nubs and the eyes are too far spaced apart.
Makes him look like a human/bug.
Also, I don't know if it was what you were going for but the belly looks like he's been drinking too much beer.
He's got a beer belly.